US7152719B2 - Adjustable-length compression spring and seat provided therewith - Google Patents

Adjustable-length compression spring and seat provided therewith Download PDF

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Publication number
US7152719B2
US7152719B2 US10/967,164 US96716404A US7152719B2 US 7152719 B2 US7152719 B2 US 7152719B2 US 96716404 A US96716404 A US 96716404A US 7152719 B2 US7152719 B2 US 7152719B2
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US
United States
Prior art keywords
casing
overflow
throttle element
actuation
valve
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
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US10/967,164
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English (en)
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US20050088021A1 (en
Inventor
Holger Knaust
Rainer Knapp
Walter Bohm
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Suspa GmbH
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Suspa Holding GmbH
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Publication date
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Assigned to SUSPA HOLDING GMBH reassignment SUSPA HOLDING GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BOHM, WALTER, KNAPP, RAINER, KNAUST, HOLGER
Publication of US20050088021A1 publication Critical patent/US20050088021A1/en
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Assigned to SUSPA GMBH reassignment SUSPA GMBH CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: SUSPA HOLDING GMBH
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/02—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable
    • B60N2/04—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable
    • B60N2/10—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable tiltable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/02—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable
    • B60N2/22—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the back-rest being adjustable
    • B60N2/23—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the back-rest being adjustable by linear actuators, e.g. linear screw mechanisms
    • B60N2/231—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the back-rest being adjustable by linear actuators, e.g. linear screw mechanisms by hydraulic actuators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/02—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum
    • F16F9/0209—Telescopic
    • F16F9/0245—Means for adjusting the length of, or for locking, the spring or dampers
    • F16F9/0272—Means for adjusting the length of, or for locking, the spring or dampers with control rod extending through the piston rod into the piston

Definitions

  • the invention relates to an adjustable-length compression spring comprising a casing with a central longitudinal axis, the casing being filled with free-flowing pressure fluid; a guide and seal unit which closes the casing at a first end; a piston rod which, through the guide and seal unit, is extended from, and sealed towards, the first end of the casing, having an outer end; a piston which is joined to the piston rod and sealingly guided in the casing; a first sectional casing chamber which is unilaterally defined by the piston and filled with pressure fluid; a second sectional casing chamber which is connectable to the first sectional casing chamber and filled with pressure fluid; and an operating valve for connection to each other of the sectional casing chambers by an actuation and overflow assembly, the valve comprising a valve pin which, from outside the casing, is movable into a tripped position, in which the valve pin enables the actuation and overflow assembly to be released, and into a shut-off position, in which the valve pin shuts off the actuation and
  • a blockable compression spring of the generic type is known from EP 1 288 525 A2.
  • Two valves are arranged in series in the actuation and over-flow assembly between the two sectional casing chambers, one of them being the operating valve that includes the valve pin as mentioned above.
  • the second valve is a relay valve that blocks the entire actuation and over-flow assembly independently of the respective position of the operating valve. When the operating valve is open, the relay valve can be transferred by pressure actuation into a position of release with pressure fluid flowing freely between the two sectional casing chambers.
  • This known gas spring is used in adjustable-backrest seats of vehicles. When a backrest is tilted backwards and an upright position is needed, a user will start by actuating the operating valve.
  • the relay valve stays in the position of blocking so that the backrest is kept in the originally tilted position even when the operating valve is tripped. Only when the user leans back sufficiently for generation, by the backrest, of control pressure that transfers the relay valve into a position of release, the operating valve and the relay valve are open, releasing the actuation and overflow assembly. Only then the backrest will conform to a more upright position of a user's back when he straightens up. This idea of transferring the backrest into a more upright position may prevent the compression spring, after actuation of the operating valve, from extending inadvertently and hitting against a user's back, but it is complicated and, above all, hardly intuitive. When the operating valve has been actuated, the user, though wishing a more upright position, must start by leaning back.
  • the actuation and overflow assembly comprises an overflow portion with at least two overflow passages connected in parallel; wherein a throttle element for the actuation and overflow assembly is provided, cooperating with a first overflow passage of the overflow passages, the throttle element, from outside the casing, being movable into a position of release, in which it releases the first overflow passage with the valve pin in a tripped position, and the throttle element being movable into a position of throttling, in which it shuts off the first overflow passage with the valve pin also in the tripped position; wherein at least one further overflow passage of the over-flow passages is designed for throttled flow through the at least one further overflow passage to take place in the position of throttling of the throttle element with the operating valve tripped.
  • the gist of the invention resides in that the actuation and overflow assembly is provided with at least two overflow passages which are connected in parallel, the second overflow passage being a bypass of the first overflow passage that includes the throttle element.
  • a reduced number of components is needed when the throttle element is a sealing element which is displaceable in relation to the valve pin, in the position of throttling being sealed inwardly towards the valve pin; and outwardly towards a casing-chamber portion which forms a defining wall for the first as well as the second overflow passage.
  • a throttle element in the form of a displaceable sealing ring, in particular an O-ring, can be manufactured at a low cost and from material of little wear and nevertheless excellent sealing properties.
  • Actuation of the throttle element by pressure modification, incited from outside, of the pressure fluid in at least one of the sectional casing chambers can be put into practice easily, needing no mechanical articulation of the throttle element.
  • Embodying the throttle element for automatic return from the position of release into the position of throttling when the valve pin, after valve operation, is back in the shut-off position implies a smart way of integration into a compression spring and high convenience of operation.
  • An energy storing device in the form of a compressed-gas chamber and oil used as a pressure fluid have shown excellent results, depending on the field of application.
  • this object is attained in a seat in which the compression spring transfers a backrest of the seat from a more inclined to a less inclined position by extension of the piston rod out of the casing.
  • the backrest is prevented from inadvertently shooting up into an upright position by extension of the piston rod after the valve pin has been tripped, giving the seated person a push. Instead, the backrest moves up throttled and slowly. If the throttle element is additionally transferred into a position of release, controlled cancellation of the throttling effect is possible, enabling more rapid regulation of the backrest.
  • An operating member which is disposed on the seat in the vicinity of the seating area enables the valve pin to be tripped conveniently.
  • the compression spring according to the invention is used for instance in office chairs.
  • it can be employed for example in vehicle seats such as seats in busses, trains or planes. Further application is conceivable in seats of movie theaters.
  • FIG. 1 is a longitudinal sectional view of a compression spring
  • FIG. 2 is a diagrammatic view of a seat including a compression spring according to the invention.
  • FIG. 3 is a view, on an enlarged scale, of details of FIG. 2 (not visible in FIG. 2 ) of a valve actuation arrangement of the compression spring;
  • FIGS. 4 to 7 are instantaneous views of details of the compression spring in the vicinity of a piston thereof, illustrating the displacement of a valve pin and a throttle element upon actuation of the valve of the compression spring.
  • the blockable, adjustable-length compression gas spring seen in its entirety in FIG. 1 includes a substantially cylindrical casing 1 made from a tube, one end 2 of which is closed gas-tightly by a bottom 3 which a fastening element 4 is attached to.
  • the other end 5 of the casing 1 is provided with an annular guide and seal unit 6 for liquid sealing, the unit 6 serving to guide and seal a piston rod 8 that is displaceable in the casing 1 concentrically of the central longitudinal axis 7 thereof.
  • the free end 9 , outside the casing 1 , of the piston rod 8 is likewise provided with a fastening element 10 .
  • the end 11 , inside the casing 1 , of the piston rod 8 is provided with a piston 12 which is guided on an inside wall 13 of the casing 1 and liquid-sealed towards the wall 13 by a seal 14 .
  • the piston 12 divides the inside of the casing 1 into a first sectional casing chamber 15 between the piston 12 and the guide and seal unit 6 and a second sectional casing chamber 16 that faces away from the chamber 15 .
  • the second sectional casing chamber 16 is again defined by a sliding piston 17 which slides on the inside wall 13 of the casing 1 and is liquid-sealed towards it by a seal 18 .
  • a compressed gas chamber 19 is disposed between the sliding piston 17 and the bottom 3 , holding gas under pressure and serving as an energy storing device.
  • the sectional casing chambers 15 , 16 are filled with fluid as a pressure medium, for instance hydraulic oil.
  • the piston 12 includes a blocking valve 20 as an operating valve by means of which to unite, or separate from each other, the sectional casing chambers 15 , 16 .
  • An actuation and overflow assembly 21 is produced between the sectional casing chambers 15 , 16 when they are united (cf. FIG. 5 ).
  • FIG. 1 shows the blocking valve 20 in a shut-off position.
  • the blocking valve 20 comprises a valve gate 22 on the side of the piston 12 that is turned towards the seal and guide unit 6 .
  • the hollow valve gate 22 holds a hollow cylindrical overflow gate 23 which has an annular bottom 24 turned towards the second sectional casing chamber 16 .
  • the overflow gate 23 defines a first overflow passage 25 which continues the actuation and overflow assembly 21 towards the first sectional casing chamber 15 .
  • the overflow gate 23 comprises side-cuts 26 that join the inside of the overflow gate 23 to an annular chamber 27 inside the valve gate 22 . Via another side-cut 28 , the annular chamber 27 is again connected to the first sectional casing chamber 15 .
  • bypass groove 29 which constitutes a second overflow passage which, as part of the overflow assembly 21 , is connected in parallel to the first overflow passage 25 , serving as a bypass therefor.
  • a sliding valve pin 30 which is coaxial of the axis 7 and shown in a shut-off position in FIG. 1 , passes through the overflow gate 23 .
  • the valve pin 30 is externally sealed in between the overflow gate 23 and the hollow piston rod 8 .
  • the end of the valve pin 30 that is turned towards the second sectional casing chamber 16 is provided with a valve disk 32 of two-stage conical expansion.
  • a conical wall 33 Disposed on the free end of the valve pin 30 is a conical wall 33 , of greater diameter, of the valve disk 32 , serving for defined motion of the valve pin 30 in the push-out direction thereof.
  • the conical wall 33 cooperates with an opposite surface 34 of the valve gate 22 .
  • a seal 34 a of rectangular cross-sectional shape seals the conical wall 33 towards the valve gate 22 .
  • the valve pin 30 comprises a cylindrical surface 35 which, in the position of throttling seen in FIG. 1 , seals towards the overflow gate 23 via a seal that constitutes a throttle element 36 .
  • the throttle element 36 is an O-ring.
  • the throttle element 36 rests on the annular bottom 24 of the overflow gate 23 in the direction towards the second sectional casing chamber 16 . In this way, the throttle element 36 is safe-guarded against further dislocation along the central longitudinal axis 7 towards the second sectional casing chamber 16 .
  • relocation of the throttle element 36 is possible within an overflow chamber 39 which is formed in the valve gate 22 by the overflow gate 23 and an adjoining intermediate ring 38 ; the over-flow chamber 39 is part of the first overflow passage 25 , which is going to be described in detail.
  • the valve pin 30 comprises a tapered section 40 , an annular chamber 41 being formed between this section 40 and the neighbouring parts, namely the overflow gate 23 and the intermediate ring 38 ; this chamber 41 communicates with the side cuts 26 .
  • a valve operating rod 42 is disposed in the hollow piston rod 8 ; it bears against the valve pin 30 and is displaceable in the direction of the axis 7 and can be actuated by being pushed from the end 9 .
  • the free end, projecting from the piston rod 8 , of the valve operating rod 42 is an operating button 43 .
  • FIG. 2 is a diagrammatic view of the arrangement of the compression gas spring of FIG. 1 on a seat 44 (also plotted diagrammatically).
  • the seat 44 has a seating area 45 and a backrest 46 .
  • the backrest 46 can be pivoted about a pivot joint 47 towards the seating area 45 .
  • the seat 44 is a vehicle seat, for example in a bus, train or plane.
  • a supporting frame 48 is disposed underneath the seating area 45 , connecting the seating area 45 with a supporting rail 49 which is fixed to a bottom 50 .
  • the supporting frame 48 is connected with the supporting rail 49 in such a way that the seat 44 can be relocated for modification of the distance between successive seats 44 .
  • the supporting frame 48 comprises three vertical props 51 which are arranged successively in the direction of relocation.
  • the compression gas spring according to FIG. 1 is disposed horizontally between the middle prop 51 and the rear prop 51 that adjoins the pivot joint 47 .
  • the fastening element 4 is rotatably mounted on the middle prop 51 .
  • the piston rod 8 is axially guided on a guide hole 52 in the rear prop 51 .
  • the free end 9 of the piston rod 8 is connected with a coupling rod 54 , with a pivot joint 55 being disposed between the coupling link 53 and the coupling rod 54 , having a pivoting axis that is parallel to the pivot joint 47 .
  • the coupling rod 54 constitutes a prolongation of the backrest 46 beyond the pivot joint 47 ; it is tightly connected with the backrest 46 for pivoting about the joint 47 .
  • Solid lines in FIG. 2 show the backrest 46 in an upright position with the piston rod 8 of the compression gas spring being maximally extended from the casing 1 .
  • Dashed lines in FIG. 2 illustrate the backrest 46 in an inclined position as compared to the upright position, with the backrest 46 and the coupling rod 54 being pivoted about the pivot joint 47 and with the piston rod 8 and the piston 12 that is joined thereto being retracted into the casing 1 of the compression gas spring.
  • FIG. 3 shows that, for actuation of the operating button 43 , provision is made for a complementary contact portion of an operating member 56 in the area of connection between the coupling rod 54 and the piston rod 8 , with the operating member 56 resting pivotably on the coupling link 53 and, for example by a corresponding Bowden cable, cooperating with an operating lever or press button disposed in the vicinity of the underside of the seating area 45 for actuation of the valve operating rod 42 .
  • FIG. 4 illustrates the blocking valve 20 of FIG. 1 with the valve pin 30 in the shut-off position and the throttle element 36 in a position of throttling.
  • the pressure of the hydraulic oil in the sectional casing chamber 15 is higher than it is in the sectional casing chamber 16 when the compression gas spring is relieved. This is due to the fact that the cross-sectional area of the piston 12 that is turned towards the sectional casing chamber 16 exceeds the cross-sectional area turned towards the sectional casing chamber 15 , this latter area being reduced by the cross-sectional surface of the piston rod 8 .
  • FIG. 5 shows the valve pin 30 in a position of tripping displaced to the left as opposed to the shut-off position, the valve pin 30 having been moved into this position by the operating button 43 being actuated by the operating member 56 and the operating lever joined thereto.
  • the throttle element 36 keeps sealing the overflow gate 23 towards the cylindrical wall 35 of the valve pin 30 so that the first overflow passage 25 remains blocked.
  • Flow connection between the sectional casing chambers 15 , 16 is exclusively ensured by the bypass groove 29 . Therefore, in FIG. 5 , the compression gas spring is simultaneously tripped and maximally throttled so that the relieved backrest 46 slowly returns from a strongly inclined position into a less inclined position.
  • FIG. 6 shows the throttle element 36 in the position of release in which it is maximally displaced in the direction of the arrow 37 inside the overflow gate 23 , bearing against the intermediate ring 38 .
  • the valve pin 30 is still in the tripped position in FIG. 6 , meaning that the user continues to actuate the operating lever for actuation of the operating button 43 .
  • hydraulic oil is able to flow between the first sectional casing chamber 15 and the second sectional casing chamber 16 through the first over-flow passage 25 as well as through the bypass groove 29 .
  • the piston may now be pushed into the casing 1 so that the backrest 46 can be adjusted conveniently to a more inclined position.
  • the user wishes to stop the adjustment of the backrest 46 , he releases the operating lever that acts on the operating button 43 when the backrest 46 is in the desired position so that the blocking valve 20 moves into the shut-off position seen in FIG. 7 .
  • the seal 34 a seals the conical wall 33 towards the valve gate 22 , blocking the actuation and overflow assembly 21 . Consequently, the valve 20 is blocked in the position of FIG. 7 .
  • the throttle element 36 Owing to the higher pressure (as explained above) in the first sectional casing chamber 15 as compared to the second sectional casing chamber 16 , the throttle element 36 , subsequently to the instantaneous view of FIG. 7 , is automatically relocated from the position of release back into the position of throttling. Hydraulic oil flows through the bypass groove 29 . At the end of this process of relocation the blocking valve 20 will again be in the position seen in FIG. 4 .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Transportation (AREA)
  • Chairs For Special Purposes, Such As Reclining Chairs (AREA)
  • Fluid-Damping Devices (AREA)
  • Springs (AREA)
US10/967,164 2003-10-22 2004-10-19 Adjustable-length compression spring and seat provided therewith Expired - Fee Related US7152719B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10349157.0 2003-10-22
DE10349157A DE10349157A1 (de) 2003-10-22 2003-10-22 Längenverstellbare Druckfeder sowie Sitz mit einer derartigen Druckfeder

Publications (2)

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US20050088021A1 US20050088021A1 (en) 2005-04-28
US7152719B2 true US7152719B2 (en) 2006-12-26

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US10/967,164 Expired - Fee Related US7152719B2 (en) 2003-10-22 2004-10-19 Adjustable-length compression spring and seat provided therewith

Country Status (8)

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US (1) US7152719B2 (es)
EP (1) EP1526301B1 (es)
JP (1) JP4139807B2 (es)
KR (1) KR100764289B1 (es)
AT (1) ATE331156T1 (es)
CA (1) CA2484249C (es)
DE (2) DE10349157A1 (es)
ES (1) ES2268558T3 (es)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060290038A1 (en) * 2005-06-24 2006-12-28 Suspa Holding Gmbh Adjustable-length gas spring
US20120139302A1 (en) * 2010-12-03 2012-06-07 Jcedesign Airplane passenger seat
US20140353098A1 (en) * 2010-03-17 2014-12-04 Avm Industries Selectively fixed damper
US20160297533A1 (en) * 2015-04-13 2016-10-13 Encore Seats, Inc. Aircraft seating assembly
US20170009882A1 (en) * 2015-07-09 2017-01-12 Suspa Gmbh Piston device, method for the production of such a piston device and piston cylinder unit comprising such a piston device
US10144515B2 (en) 2016-04-01 2018-12-04 Encore Seats, Inc. Aircraft seating assembly and components
US10202158B2 (en) * 2016-08-31 2019-02-12 Giant Manufacturing Co., Ltd. Adjustable seat tube structure and bicycle
US10598246B2 (en) 2017-06-06 2020-03-24 Reyco Granning, Llc Strut assembly with combined gas spring and damper

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004047449C5 (de) * 2004-09-30 2009-10-08 Stabilus Gmbh Blockierbare Kolben-Zylindereinheit
DE102008061213A1 (de) * 2008-12-09 2010-06-10 Suspa Holding Gmbh Längenverstellbare Gasfeder
DE102011015959A1 (de) * 2011-04-04 2012-10-04 Stabilus Gmbh Blockierbares Kolben-Zylinderaggregat
DE102011055688B4 (de) * 2011-11-24 2023-02-09 Stabilus Gmbh Arretierbares Kolben-Zylinder-Aggregat
US11352143B2 (en) 2018-12-18 2022-06-07 The Boeing Company Transformable seat assembly
US11180256B2 (en) 2018-12-18 2021-11-23 The Boeing Company Transformable seat assembly
US10864992B2 (en) * 2018-12-18 2020-12-15 The Boeing Company Transformable seat assembly
US10934001B2 (en) 2018-12-18 2021-03-02 The Boeing Company Methods of assigning seats to utilize transformable seat assemblies
US11059588B2 (en) 2018-12-18 2021-07-13 The Boeing Company Transformable seat assembly
CN111692259A (zh) * 2020-06-24 2020-09-22 安徽天航机电有限公司 一种机械手防振动用二级减振缓冲装置
GB2613603A (en) * 2021-12-08 2023-06-14 Rubenji Ltd Seat Assembly

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EP1288525A2 (de) 2001-09-03 2003-03-05 Stabilus GmbH Auslöseeinrichtung für ein blockierbares Kolben-Zylinderaggregat
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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060290038A1 (en) * 2005-06-24 2006-12-28 Suspa Holding Gmbh Adjustable-length gas spring
US7540362B2 (en) * 2005-06-24 2009-06-02 Suspa Holding Gmbh Adjustable-length gas spring
US20140353098A1 (en) * 2010-03-17 2014-12-04 Avm Industries Selectively fixed damper
US20120139302A1 (en) * 2010-12-03 2012-06-07 Jcedesign Airplane passenger seat
US20160297533A1 (en) * 2015-04-13 2016-10-13 Encore Seats, Inc. Aircraft seating assembly
US9764844B2 (en) * 2015-04-13 2017-09-19 Encore Seats, Inc. Aircraft seating assembly
US10392114B2 (en) 2015-04-13 2019-08-27 Encore Seats, Inc. Aircraft seating assembly
US20170009882A1 (en) * 2015-07-09 2017-01-12 Suspa Gmbh Piston device, method for the production of such a piston device and piston cylinder unit comprising such a piston device
US10144515B2 (en) 2016-04-01 2018-12-04 Encore Seats, Inc. Aircraft seating assembly and components
US10202158B2 (en) * 2016-08-31 2019-02-12 Giant Manufacturing Co., Ltd. Adjustable seat tube structure and bicycle
US10598246B2 (en) 2017-06-06 2020-03-24 Reyco Granning, Llc Strut assembly with combined gas spring and damper

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DE10349157A1 (de) 2005-05-19
JP4139807B2 (ja) 2008-08-27
EP1526301A1 (de) 2005-04-27
DE502004000818D1 (de) 2006-08-03
US20050088021A1 (en) 2005-04-28
EP1526301B1 (de) 2006-06-21
ES2268558T3 (es) 2007-03-16
ATE331156T1 (de) 2006-07-15
KR20050039576A (ko) 2005-04-29
KR100764289B1 (ko) 2007-10-05
JP2005172221A (ja) 2005-06-30
CA2484249A1 (en) 2005-04-22
CA2484249C (en) 2012-11-20

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